CVE-2026-41516 OP-TEE: Hisilicon HPRE PKCS#1 v1.5 Decryption Padding Oracle
An attacker can recover RSA PKCS#1 v1.5 plaintext via a padding oracle in the Hisilicon HPRE crypto driver of OP-TEE OS.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-41516?
CVE-2026-41516 is a low-severity vulnerability in OP-TEE optee_os, published on 6 Jul 2026. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
OP-TEE is a Trusted Execution Environment (TEE) designed as companion to a non-secure Linux kernel running on Arm; Cortex-A cores using the TrustZone technology. Starting in version 4.5.0 and prior to version 4.11.0, the RSA PKCS#1 v1.5 decryption implementation in the Hisilicon HPRE crypto driver uses non-constant-time `memcmp()` for label hash verification and has multiple distinguishable error paths. This creates a Bleichenbacher-style padding oracle that allows an attacker to recover RSA PKCS#1 v1.5 plaintext. Version 4.11.0 contains a patch. As a workaround, disable Hisilicon HPRE RSA driver with `CFG_HISILICON_ACC_V3=n`.
Weakness: CWE-208
Which versions are affected by CVE-2026-41516?
It affects 1 product.
Products include Trustedfirmware Op-Tee.
How do I fix CVE-2026-41516?
No fix has been published for CVE-2026-41516 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-41516 being exploited?
There is no known exploitation of CVE-2026-41516 in the wild and no public exploit code.
Other vulnerabilities in OP-TEE optee_os
Sources
Also known as DEBIAN-CVE-2026-41516, GHSA-wxp6-8wwr-h4gf, UBUNTU-CVE-2026-41516.